Synthesis of composition-controlled iron-based nanoparticles for application to magnetic refrigeration

用于磁制冷应用的成分控制铁基纳米颗粒的合成

• 批准号: 23760620
• 负责人: FUJIEDA Shun
• 金额: $ 2.83万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23760620/
• 关键词: 電子・磁気物性; 相転移; 合金微粒子; 還元反応; X線吸収分光; Fe-Pt合金; ナノ粒子

FePt nanoparticles composed of crystalline fcc-FePt alloy phase and poorly crystallized Fe- and Pt-oxide phase were synthesized in polyol solution. In X-ray diffraction patterns of the specimens which were heat-treated at temperatures above 573 K in a mixture of 5%H_2 in Ar, diffraction peaks corresponding to superlattice lines of L1_0 type structure were observed. It is highly probable that such disorder-order transformation of FePt nanoparticles is accompanied by compositional homogenization due to the reduction of the poorly crystallized Fe- and Pt-oxide phase. It was also shown that intermediate fine particles precipitated in poyol solution containing Fe and Ni salts were reduced during post-annealing in a mixture of 5%H_2 in Ar. Such technique is useful to synthesis FeNi alloy fine particles over a wide composition range.

在多元醇溶液中合成了由结晶的fcc-FePt合金相和低结晶的Fe-和pt -氧化物相组成的FePt纳米颗粒。在掺5%H_2的氩气中经573 K以上热处理后的样品的x射线衍射图中，观察到与L1_0型超晶格线相对应的衍射峰。FePt纳米颗粒的这种无序-有序转变很可能伴随着成分均匀化，这是由于Fe-和pt氧化相的低结晶性减少。结果表明，在5%H_2 - Ar混合物中退火后，在含Fe和Ni盐的多元醇溶液中析出的中间细颗粒被还原，该技术可用于合成大成分范围的FeNi合金细颗粒。

项目成果

Synthesis of composition-controlled FeNi alloy particles

成分控制的 FeNi 合金颗粒的合成

• 发表时间: 2012
• 作者: W. Miyamura;S. Fujieda;K. Shinoda;Shigeru Suzuki;B. Jeyadevan
• 通讯作者: B. Jeyadevan

Synthesis of Magnetite Particles by Oxidation of Hydroxyl-chloride Green Rust Suspension under Controlled Conditions

控制条件下羟基氯化物绿锈悬浮液氧化合成磁铁矿颗粒

• DOI: 10.2355/isijinternational.53.894
• 发表时间: 2013
• 期刊: ISIJ International
• 影响因子: 1.8
• 作者: A. Yoshino;S. Fujieda;K. Shinoda;S. Suzuki
• 通讯作者: S. Suzuki

液相合成と還元熱処理によるFeNi合金粒子の組成制御

液相合成和还原热处理FeNi合金颗粒的成分控制

• 发表时间: 2012
• 作者: 宮村渉;藤枝俊;篠田弘造;鈴木茂;バラチャンドラン ジャヤデワン
• 通讯作者: バラチャンドラン ジャヤデワン

Control of working temperature of isothermal magnetic entropy change by hydrogen absorption into La_<0.8>Nd_<0.2>(Fe_<0.88>Si_<0.12>)_13 for magnetic refrigerant

磁性制冷剂La_<0.8>Nd_<0.2>(Fe_<0.88>Si_<0.12>)_13吸氢控制等温磁熵变工作温度

• 发表时间: 2012
• 作者: S. Fujieda;A. Fujita;K. Fukamichi;S. Suzuki
• 通讯作者: S. Suzuki

Low Temperature Synthesis of FePtNanoparticles by Polyol process

多元醇法低温合成FePt纳米粒子

• 发表时间: 2011
• 作者: K. Fukuda;S. Fujieda;K. Shinoda;S. Suzuki;B. Jeyadevan
• 通讯作者: B. Jeyadevan